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Over the years, I have used many tools like Anki, Memrise, and Duolingo, but none of them are like Bupro. I consider it the best and most efficient tool for systematically learning Japanese (and I’m not even a native English speaker). The only two regrets are that some grammar points are currently missing and that it only supports English. I hope the developers might conduct user surveys to add other display languages.
Thank you for the kind words!
We are always updating our grammar list, and if you feel something is missing feel free to post on community forums!
We will make sure to add new content.
As for other languages support, we have recetly added Spanish support, and we hope to add other languages in the future. Cheers!